Two SiO2–Au nanoparticles were prepared. Silicon dioxide (SiO2) structures with average size of 143 and 90 nm were synthesized using the sol–gel method. Gold (Au) nanoparticles of ~ 5 nm were deposited using the deposition–precipitation process on each dielectric platform. The concentration of silanol groups of SiO2 spheres was obtained. The size and form of SiO2, Au and SiO2–Au nanoparticles were evaluated by transmission electron microscopy (TEM). The TEM micrographs confirmed the size and spherical form for SiO2 and Au nanoparticles with high monodispersity, the decoration of SiO2 spheres with metallic nanoparticles was also confirmed. The reflectance spectrum revealed a decreased of reflectivity around 516 nm for SiO2–Au structures, the decrease of reflectance was associated with the presence of gold nanoparticles on dielectric spheres. The SiO2–Au structures (at different mass 0.1–0.6 mg/ml) were dispersed in deionized water. Thermal diffusivity of SiO2–Au particles in water was studied using the thermal lens (TL) spectroscopy. The results revealed an increase in thermal diffusivity as the SiO2–Au concentration was increased. The thermal property was independent on the size of the SiO2 spheres used.
|Journal||Applied Physics A: Materials Science and Processing|
|State||Published - 1 Mar 2020|
- Au nanoparticles
- SiO spheres
- Thermal diffusivity